Dalian qianda trading co. LTD
Associate: manager li
Associate: manager pu
秒速时时彩Web site: www.sofoi.cn
秒速时时彩tongren street, xigang district, dalian city, liaoning province
The application of modern investment casting method in industry was in the 1940s. The development of aero-jet engines at that time required the manufacture of heat-resistant alloy parts with complex shapes, sizes and smooth surfaces, such as blades, impellers and nozzles. Because heat-resistant alloys are difficult to machine and the parts are of complex shapes, they cannot or are difficult to make by other means,
秒速时时彩Therefore, it is necessary to look for a new precision molding process. Therefore, by referring to the lost wax precision casting passed down from ancient times, through the improvement of materials and technology, modern investment precision casting method has obtained important development on the basis of ancient technology. Therefore, the development of aviation industry has promoted the application of investment precision casting, and the continuous improvement and improvement of investment precision casting has also created favorable conditions for the aviation industry to further improve the performance.
When pressing the mold, the cavity surface is pressed with a high degree of smoothness. Therefore, the surface smoothness of the mold is also relatively high. In addition, the shell by high temperature resistance of the special binder and refractory materials made of refractory coating coated hanging on the investment model, and direct contact with molten metal cavity surface finish high. Therefore, the surface finish of investment castings is higher than that of general precision castings, generally up to Ra.1.6~3.2 m.
Another advantage of the precision casting wax, investment casting method, is that it can cast complex castings of various alloys, especially high-temperature alloy castings. For example, the blade of a jet engine, its streamline profile and cooling chamber, can hardly be formed by mechanical processing. The production by investment casting process can not only achieve batch production and ensure the consistency of casting, but also avoid the stress concentration of the residual blade after machining.
In addition, problems with handling or shell shape can lead to sand holes; There is a certain crack tendency; There is a flaw, it is easy to be ignored in the investment casting, steel casting, in particular, the decarburization layer surface will appear, can achieve 1 mm or so, serious and even lead to difficulty need quenching surface hardness of castings quenching. Can say, general casting defects, investment casting, is generated and the need to particular case is particular analysis.